Spenser is an ordinary elementary boy who dislikes reading until he meets a mysterious cowboy who gives him a magical stone. Spenser holds the stone as he's reading and is transported into the book. After convincing the villagers he is there to help, he joins with Arco, the cave boy leader, to help stop the  dinosaur destroying their village. Through teamwork, they discover the dinosaur has a branch lodged above his eye. They travel to the local healer for a sleeping potion in hopes of putting the dinosaur to sleep. Will they be able to help the dinosaur and will Spenser find...